Question
Three taps A, B and C can fill a tank in 10, 18 and 6
hours, respectively. If B is open all the time and A and C are open for one hour each alternatively, starting with A, the task will be filled in.Solution
A B C 10 18 6 90 9 5 15 First day B+A=9+5=14 Second day B+C=5+15=20 fill tank in two days =14+20=34 similarly work done in four days =68 Now remaining work done by A+B- In fifth day, =68+14 =82 Now remaining work =90-82=8 Remaining work done by B+C=8/20=2/5 Total time =5+2/5=27/5
- There are nine consecutive even numbers. The smallest number is 20% less than the largest number. What is the sum of the second smallest and second largest...
How many numbers in the range from 300 to 900 are divisible by 7, 14, and 28?
Find the sum of the first 45 natural numbers.
A and B have 6 and 7 pieces of bread respectively. They share their food with C, who pays them Rs 42 for the received breads. If each of them has equal ...
- If the 4-digit number p89q is exactly divisible by 9, what is the least value of (p + q)?
The sum of three consecutive natural numbers each divisible by 5, is 255. The largest among them is:
- In a party, the ratio between number of present male and number of present female is 6:5 respectively. After 3 hours, 30 males join the party and 5 women l...
A two-digit natural number has the property that the digit in the tens place is the square of the digit in the units place. When the original number is ...
Find the average of first 16 whole numbers.
A number gives a remainder 34 when divided by 391. What remainder will it leave when divided by 17?
Relevant for Exams:
